Benelli M2 Field 12 Gauge Semi-Automatic Shotgun with Gore Optifade Timber Stock for sale. Benelli’s M2 semiautomatic shotgun is legendary for rugged reliability you can count on in the most adverse of circumstances and conditions. The M2 Field shotgun is light, durable, fast-handling and the backbone of the Benelli semi-auto line. It cycles everything from target loads to the heaviest 3-inch magnums, and has earned a reputation for excellence in fields, blinds and at shooting ranges around the world.